Mass movements in small canyons in the northeast of Baiyun deepwater area, north of the South China Sea

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• 作者：Xishuang Li ; Lejun Liu ; Jiagang Li ; Shan Gao ; Qingjie Zhou…
• 关键词：mass movement ; geophysical data ; trigger mechanism ; submarine canyon ; north of the South China Sea
• 刊名：Acta Oceanologica Sinica
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：34
• 期：8
• 页码：35-42
• 全文大小：5,692 KB
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• 作者单位：Xishuang Li (1)
  Lejun Liu (1)
  Jiagang Li (2)
  Shan Gao (1)
  Qingjie Zhou (1)
  Tianyun Su (1)
  
  1. The First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China
  2. Research Center of China National Offshore Oil Corporation, Beijing, 100027, China
  
• 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1099

文摘

The process of mass movements and their consequent turbidity currents in large submarine canyons has been widely reported, however, little attention was paid to that in small canyons. In this paper, we document mass movements in small submarine canyons in the northeast of Baiyun deepwater area, north of the South China Sea (SCS), and their strong effects on the evolution of the canyons based on geophysical data. Submarine canyons in the study area arrange closely below the shelf break zone which was at the depth of-00 m. Within submarine canyons, seabed surface was covered with amounts of failure scars resulted from past small-sized landslides. A complex process of mass transportation in the canyons is indicated by three directions of mass movements. Recent mass movement deposits in the canyons exhibit translucent reflections or parallel reflections which represent the brittle deformation and the plastic deformation, respectively. The area of most landslides in the canyons is less than 3 km2. The trigger mechanisms for mass movements in the study area are gravitational overloading, slope angle and weak properties of soil. Geophysical data indicate that the genesis of submarine canyons is the erosion of mass movements and consequent turbidity currents. The significant effects of mass movements on canyon are incision and sediment transportation at the erosion phases and fillings supply at the fill phases. This research will be helpful for the geological risk assessments and understanding the sediment transportation in the northern margin of the SCS.